G. Y. Jin

Continuous-wave dual-wavelength operation of a diode-end-pumped Nd:GGG laser

A dual-wavelength continuous-wave (CW) diode-pumped Nd:LuVO4 laser that generates simultaneous laser action at the wavelengths 1066 and 1343 nm is demonstrated. A total dual-wavelength output power of 2.58 W was achieved at the incident pump power of 18.2 W. Furthermore, intracavity sum-frequency mixing at 1066 and 1343 nm was then realized in a LBO crystal to reach the yellow range. We obtained a total CW yellow output power of 830 mW at 594 nm.

Research on 2-μm solid-state lasers

Diode-pumped solid-state 2 μm lasers have rapid development for their efficient, compact and stable performance. In this paper, we will introduce and discuss the work on 2 μm solid-state-lasers. The advantages and disadvantages of four ways to realize 2 μm laser output are generalized and discussed.

Diode-pumped CW Nd:YAG laser at 1116 nm based on the 4F3/2-4I11/2 transition

We describe the output performances of the 1356 nm 4F3/2-4I13/2 transition (generally used for a 1319 nm transition) in Nd:YAG under in-band pumping with diode laser at the 809 nm wavelength. An end-pumped Nd:YAG crystal yielded 1.02 W of continuous-wave (CW) output power for 18.2 W of incident pump power. Moreover, intracavity second-harmonic generation (SHG) has also been achieved with a power of 290 mW at 678 nm by using a LiB3O5 (LBO) nonlinear crystal. The red beam quality factor M2 was less than 1.37. The red power stability was less 3.2% in 4 h.

Diode-pumped Nd:YVO4-LBO laser at 544 nm based on intracavity sum frequency generation

A dual-wavelength continuous-wave (CW) diode-pumped Nd:YVO4 laser that generates simultaneous laser action at the wavelengths 914 and 1342 nm is demonstrated. A total dual-wavelength output power of 1.79 W was achieved at the incident pump power of 18.2 W. Furthermore, intracavity sum-frequency mixing at 914 and 1342 nm was then realized in a LBO crystal to reach the yellow-green range. We obtained a total CW output power of 212 mW at 544 nm.

Efficient all solid-state dual-wavelength Nd:LuVO4 laser at 916 and 1343 nm and sum-frequency mixing for an emission at 545 nm

We report on the efficient continuous-wave (CW) dual-wavelength operation of a Nd:LuVO4 laser at 916 and 1343 nm. An output power of 2.15 W for the dual-wavelength was achieved at the incident pump power of 18.2 W. Intracavity sum-frequency mixing at 916 and 1343 nm was then realized in a LBO crystal to reach the yellow-green range. A maximum output power of 523 mW in the yellow-green spectral range at 545 nm has been achieved. The yellow-green output stability is better than 3.5%. The yellow-green beam quality M2 value are about 1.31 and 1.18 in both horizontal and vertical dimensions, respectively.

All-solid-state Nd:YAG-LBO yellow laser at 572 nm

We report for the first time a continuous-wave (CW) yellow laser emission by sum-frequency mixing in Nd:YAG crystal. Using type-I critical phase-matching LBO crystal, a yellow laser at 572 nm is obtained by 1444 and 946 nm intracavity sum-frequency mixing. The maximum laser output power of 178 mW is obtained when an incident pump laser of 18.2 W is used. At the output power level of 178 mW, the output stability is better than 4.2%.

Efficient CW Yb:YAG laser at 1048 nm under 968 nm diode laser pumping

We describe the output performances of the 1048 nm transition in Yb:YAG under in-band pumping with diode laser at the 968 nm wavelength. An end-pumped Yb:YAG crystal yielded 787 mW of continuous-wave (CW) output power for 9.1 W of absorbed pump power. Furthermore, 104 mW 524 nm green light was acquired by frequency doubling. Comparative results obtained for the pump with diode laser at 940 nm are given in order to prove the advantages of the in-band pumping.

Intracavity sum-frequency generation of CW blue light in Nd:LuVO4 laser

We report for the first time a continuous-wave (CW) blue laser emission by sum-frequency mixing in Nd:LuVO4 crystal. Using type-I critical phase-matching (CPM) LBO crystal, a blue laser at 493 nm is obtained by 1066 and 916 nm intracavity sum-frequency mixing. The maximum laser output power of 520 mW is obtained when an incident pump laser of 18.2 W is used. At the output power level of 520 mW, the output stability is better than 2.8%. The beam quality M2 value is are about 1.22 and 1.31 in both horizontal and vertical dimensions respectively.

Study on the laser crystal thermal compensation of LD end-pumped Nd:YAG 1319 nm/1338 nm dual-wavelength laser

The thermal model of laser diode (LD) end-pumped Nd: YAG was established. We analyzed the thermal effect of the crystal during the generation of 1319 nm/1338 nm dual-wavelength laser. Together with the bonded and non-bonded Nd:YAG crystal characteristics, we proposed to consider the bonded crystals internal temperature distribution of the three axes abc for the first time. The results showed that, compared with the non-bonded crystals, the bonded crystals could effectively reduce the crystal temperature. It provided a theoretical basis to solve the problem related to the thermal effect of the laser crystal and improve the laser output performance. The Nd:YAG laser crystal thermal model in this article could be widely applicable to similar laser crystals. The results provide a method to analyze and evaluate bonding crystal thermal compensation effectiveness by establishing the Nd:YAG crystals temperature distribution.

Double-crystal RbTiOPO4 for simultaneous 200 kHz Q-switching and second-harmonic generation in a direct-pumped Nd:YVO4 laser

We report on electro-optic (EO) Q-switched intracavity second-harmonic generation (SHG) based on double-crystal RbTiOPO4 (RTP) in an 880 nm diode-end-pumped Nd:YVO4 laser for the first time. The double-crystal RTP performed simultaneously as a high repetition rate laser Q switch and a second-harmonic generator. At a repetition rate of 200 kHz, a maximum average output power of 2.51 W at 532 nm wavelength (, 1) and a shortest pulse width of 15.7 ns were achieved under an absorbed pump power of 21 W, corresponding to an optical–optical conversion efficiency of 11.9% and a slope efficiency of 12.8%, respectively.